Weeds in rock lawns

Bear with me on the dumb question here, but I got a call today from a realtor, who has a duplex that has a rock front yard. It is FULL of weeds, and she wants me to "take care of it." In her mind, that means pull all the weeds, but it will take me forever! Isn't the only other option to spray them? I don't have an applicators license, so I can't do it. Can't weedeat them because rocks will be flying everywhere. Am I missing something obvious?

If I was you Being unlicensed I would hit them with some roundup and wait 2 weeks and then pull them. Or pull first and then roundup whatever sprouts backup as needed. Every joe blow lawn mowing guy in this country is using roundup.